Vibrating screen for molding



June 12, 1934. DUPRE 1,962,734

VIBRATING SCREEN FOR MOLDING Filed April 10. 1951 ZARMM'W Patented June 12, 1934 UNITED STATES PATENT OFFICE 1,962,734 VIBRATING SCREEN FOR MOLDING Application April 10, 1931, Serial No. 529,002

1 Claim.

This invention relates to a vibrating screen and more particularly to a vibrating screen for use in filling molding flasks with sand.

An object of this invention is to provide a simple, efficient, and practical vibrating screen for use in molding.

In accordance with the object of the present invention, a screen is provided for receiving sand from a hopper and sifting the sand into a molding flask during a vibrating movement of the screen. The screen, having a funnel-like rim, is carried by a counterweighted frame pivoted upon a horizontal axis at one side of the flask so that the screen may be rotated in a vertical plane from its horizontal operating position between the hopper and the flask, to one side of the flask where it will be out of the way during the other operations for making a mold, a pocket being provided in the side of the rim nearest the horizontal axis to prevent displacement from the screen of the retained material while the screen is in the vertical position.

The invention will be more fully understood from the following description taken in conjunc- 25 tion with the accompanying drawing, wherein Fig. 1 is a side elevational View of the screen mechanism shown in combination with a molding flask and a sand hopper;

Fig. 2 is a front elevational view of the mechanism shown in Fig. 1, the screen mechanism being shown in solid lines in its horizontal position and in dotted lines in its vertical position, and

Fig. 3 is an enlarged fragmentary sectional view of the screen mechanism.

Referring now to the drawing wherein like reference numerals designate similar parts. a molding machine is indicated generally at and has a table 11 upon which a molding flask 12 is disposed. The construction of the molding machine and the molding flask is immaterial as applicants device may be used in combination with any type molding machine or molding flask.

The screen mechanism consists of a support 15 which may be mounted upon the floor adjacent the molding machine 10, but in the present instance it is constructed to be mounted upon the molding machine as is illustrated in Fig. 2. The upper portion of the support 15 has a clamping member 16 arranged to receive and. rigidly hold in any desired vertical position a pivot rod 17 having extended through its upper end a horizontal pivot 18. A forked bracket 19 straddles the upper end of the pivot rod 1'7 and is mounted upon the pivot 18. The bracket 19 is formed so as to engage stop members 20 and 21 for holding the screen in horizontal and vertical positions respectively. Rigidly mounted upon the upper end of the bracket 19 is a counterweighted frame 25, the left end of the frame (Fig. 20) having fixed thereto a counterweight 26 and the right end of the frame being arranged to receive the screen member indicated generally at 27.

The screen member 2'7 consists of a bodyportion 30, annular in general contour and having an outwardly flared rim 31 at the top thereof and an inwardly directed guiding portion 32 at the bottom thereof. One portion of the rim 31 is extended and provided with a pocket 33 to prevent displacement from the screen member of the retained material while the screen is in a vertical position. Disposed in the body portion 30 adjacent the inwardly projecting guide portion 32 is a wire mesh or screen 34 having its peripheral edge bent upwardly and fixed to an annular retaining member 35 which engages the inner wall of the body portion and has its inner surface tapered outwardly to the upper edge for the purpose of guiding sand onto the screen 34.

The frame 25 is of channel formation and is substantially U-shaped in general contour, the right end of the frame (Fig. 2) being arcuately shaped to conform generally to the contour of the screen member 30. A resilient means is provided for supporting the screen member and for securing it to the frame 25. This means consists of a plurality of bolts 37 spaced equally around the screen member and extending through apertures 38 in the bottom portion of the frame 25. The upper ends of the bolts 37 extend through apertures in a flange 39 which is fixed to the body portion 30. The apertures in the frame 25 and in the flange 39 have concaved recesses or countersunk portions for receiving washers 40 formed with spherical surfaces to accommodate lateral movement of the screen member. Positioned between the flange 39 and the bottom portion of the frame 25 are cushioning springs 41 disposed concentrically with the bolts 37 for resiliently supporting the screen member 27. I

A vibratory movement is imparted to the screen member 27 by the energization of a motor 45, mounted upon a base 46 operatively connected to a speed reducer 47. During the actuation of the speed reducer 47 a crank 48 (Fig. 2) which is connected to the flange 39 by means of a link 49 causes a vibratory movement of the screen member 2'7. The motor 45 may be provided with an automatic switch (not shown) for closing a circuit for supplying electrical energy thereto when the screen member is in the horizontal position and for breaking the circuit to the motor when the screen member is in the vertical position.

This mechanism is shown in combination with a hopper 52 having gates 53 arranged to close the lower end of the hopper and operatively connected to each other through gear segments so that by pulling downwardly upon a lever 54, by the aid of a handle 55, the gates 53 may be swung about their pivots to allow sand to pass from the hopper and.

into the screen member 2'7.

During the operation of the device the position of the operator will be in front and almost directly beneath the handle 55 (Fig. 1). In filling the flask 12 with the desired amountof sand the screen member is in the horizontal position and while in this position the screen is vibrated due to the energization of the motor 45. While the motor is energized the crank 48 will cause a vibratory movement of the screen, while supported by springs 41, so as to eifect a sifting of the sand, indicated at 58, into the flask 12 when released from the hopper 52. The handle 55, for actuating the hopper gates, is positioned upon the left side of the hopper and would be actuated by the left hand of the operator, thus allowing the operator to swing the screening mechanism into the vertical position, shown in dotted lines in Fig. 2, by

his right hand as soon as the desired amount of sand has been sifted into the flask 12. When the screening mechanism is moved into the vertical position the retained material is prevented from dropping from the body portion by the pocket 33, the retained material being removed when desired by removing the body portion 30 or the screen 34 with the rim 35 and emptying the retained material into a receptacle (not shown).

With this screening mechanism so constructed and arranged in combination with the molding flask and sand hopper, desired quantities of sand may be disposed within the flask 12 and the screen member moved out of the way without necessitating the operator moving out of his original position in front of the molding flask and without the need of the operator first releasing the handle 55 of the hopper mechanism in order to move the sanding mechanism into its vertical position.

While the invention has been described with reference to a specific embodiment thereof it will be understood that various modifications may be made therein without departing from the spirit and scope of the present invention.

What is claimed is:

A vibrating screen for moldi g, comprising a body portion annular in general contour and having an outwardly flared rim at the top thereof and an inwardly directed guiding portion at the bottom thereof, a portion of the rim being extended and provided with a pocket for retaining all remaining material when said body portion is swung out of operating position, a porous member disposed in said body portion, means for resil iently supporting said body portion, and means operatively connected to said body portion for vibrating it.

LOUIS M. DUPRE. 

